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  <title>取得当前时间</title>
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  <div id="layout-content"><div id="function.gettimeofday" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">gettimeofday</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gettimeofday</span> &mdash; <span class="dc-title">取得当前时间</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.gettimeofday-description">
  <h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
   <span class="methodname"><strong>gettimeofday</strong></span>
    ([ <span class="methodparam"><span class="type">bool</span> <code class="parameter">$return_float</code><span class="initializer"> = false</span></span>
  ] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>

  <p class="para rdfs-comment">
   本函数是 gettimeofday(2) 的接口。返回一个关联数组，包含有系统调用返回的数据。
  </p>
 </div>

 
 <div class="refsect1 parameters" id="refsect1-function.gettimeofday-parameters">
  <h3 class="title">参数</h3>
   <p class="para">
    <dl>

     
      <dt>
<code class="parameter">return_float</code></dt>

      <dd>

       <p class="para">
        当其设为
        <strong><code>TRUE</code></strong> 时，会返回一个浮点数而不是一个数组。
       </p>
      </dd>

     
    </dl>

   </p>
 </div>

 
 <div class="refsect1 returnvalues" id="refsect1-function.gettimeofday-returnvalues">
  <h3 class="title">返回值</h3>
    <p class="para">
     默认返回一个 <span class="type"><a href="language.types.array.html" class="type array">array</a></span>。如果  <code class="parameter">return_float</code>
     设置了则会返回一个 <span class="type"><a href="language.types.float.html" class="type float">float</a></span>。
    </p>
    <p class="para">
     数组中的键为：
     <ul class="itemizedlist">
      <li class="listitem">
       <span class="simpara">
        &quot;sec&quot; - 自 Unix 纪元起的秒数
       </span>
      </li>
      <li class="listitem">
       <span class="simpara">
        &quot;usec&quot; - 微秒数
       </span>
      </li>
      <li class="listitem">
       <span class="simpara">
        &quot;minuteswest&quot; - 格林威治向西的分钟数
        
       </span>
      </li>
      <li class="listitem">
       <span class="simpara">
        &quot;dsttime&quot; - 夏令时修正的类型
       </span>
      </li>
     </ul>
    </p>
 </div>

 
 <div class="refsect1 changelog" id="refsect1-function.gettimeofday-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.1.0</td>
       <td>
        增加了参数  <code class="parameter">return_float</code>。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>

 
 <div class="refsect1 examples" id="refsect1-function.gettimeofday-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2721">
    <p><strong>Example #1 <span class="function"><strong>gettimeofday()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">gettimeofday</span><span style="color: #007700">());<br /><br />echo&nbsp;</span><span style="color: #0000BB">gettimeofday</span><span style="color: #007700">(</span><span style="color: #0000BB">true</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
Array
(
    [sec] =&gt; 1073504408
    [usec] =&gt; 238215
    [minuteswest] =&gt; 0
    [dsttime] =&gt; 1
)

1073504408.23910
</pre></div>
    </div>
   </div>
  </p>
 </div>

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